大气co2甚高光谱分辨率成像光谱仪光学设计

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1、英文摘要大气CO2甚高光谱分别率成像光谱仪分析与光学设计OpticalDesignofImagingSpectrometerwithVeryHighSpectralResolutionandforAtmosphericCO2DetectionAbstractCO2isthemostimportantgreenhousegases.Inrecentdecades,climateproblemduetoitsincreasingemissionhasbecomeoneofmajorandgloballyconcernedenvironmentalpr

2、oblems.Inordertostudyitseffectsonglobalclimatechangeandecosystem,itisnecessarytomeasurespatialandtemporalchangesofatmosphericCO2ontheglobalscalewithhighaccuracy.Inthisthesis,opticalsystemofimagingspectrometerbeingspaceborneonlowcostmini-satellitesisstudiedforthispurpose.First

3、ly,theprincipleofremotelymeasuringtheatmosphericCO2columnconcentrationisintroduced.Throughanalysisoftherelationshipamongmeasurementaccuracy,spectralresolutionandtherequiredsignaltonoiseratio(SNR)withhelpoftheLine-By-LineRadiativeTransferModel(LBLRTM),theseperformancesandthent

4、herelativeapertureandotherspecificationsoftheinstrumentaredetermined.Basedontheproposedspecificationsandminiaturizationrequirement,animagingspectrometerschemecomposedofaSchwarzchildtelescopeandanoff-axisThree-Mirroranastigmat(TMA)Littrowspectroscopicmountwithanimmersionechell

5、egratingisstudied.Theopticalpathsofitsthreebandssharethesameopticalsystem,andsoitiscompact.Then,startingfromthehalfofTMALittrowmountduetoitssymmetry,itsinitialconfigurationparametersaresolvedwithitsprimaryaberrationformula.ThecompactopticalsystemofimagingspectrometerwithF/4an

6、d21000spectralresolvingpowerisdesignedwiththecommercialopticaldesignsoftware.Inordertoreducesizeoftheimagingspectrometer，theprincipleandmethodofimmersiongratingimprovingspectralresolvingpowerandreducingspectroscopicmountsizearestudiedandanalyzed.Studyandopticaldesignshowthats

7、izeofspectroscopicmountwithanimmersionechellegratingreducedto40%oftheoriginal.Finally,tolerancesofthedesignedimmersionechellegratingopticalsystemareoptimallyallocated.Theallocationresultsinlinewithactualprocessingrequirementsareacquired.Bafflestructuresaredesigned,andstraylig

8、htanalysisshowsthatthesystemhasII大气CO2甚高光谱分辨率成像光谱仪光学设计英文摘要lowstrayli